单项选择题

A．A receipt and the cheque stub.
B．The guarantee and the receipt.
C．The radio and the box.
D．The credit card and a receipt.
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单项选择题
In what respect was Kohoutek a disappointment
A．It could be seen only through special equipment.
B．It did not approach the Earth.
C．It did not provide valuable scientific information.
D．It was moving too rapidly for scientists to photograph.
单项选择题
Why was Kohoutek referred to as the comet of the century
A．It was thought to be extremely old.
B．It passes the Earth once a century.
C．Scientists predicted it would be very bright.
D．Scientists have been tracking it for a century.
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